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CaO hydration and Ca(OH) 2 decomposition cycles can be used to supply or transport energy (heat). The reaction rates and properties of these materials are important parameters for the design of a reactor. In this work, the rates of CaO hydration and Ca(OH) 2 decomposition were measured continuously over 20 hydration/decomposition cycles by means of a high-pressure thermogravimetric apparatus. CaO was completely converted to Ca(OH) 2 in all cycles, but the CaO hydration rate decreased with increasing number of cycles. Ca(OH) 2 was decomposed to CaO completely in all cycles. The extent and rate of conversion for Ca(OH) 2 decomposition were not influenced by increasing cycle number. Eutectic melting of CaO and Ca(OH) 2 was not observed on the particles after CaO hydration or after Ca(OH) 2 decomposition. The compressive strength of CaO particles decreased with increasing cycle number, and the average compressive strength of CaO particles after 20 cycles was about 16.5 kg/cm 2 .
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Lin et al. (2009) studied this question.
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